S9S08SL8F1CTJ Datasheet, PDF (127/356 Pages) Freescale Semiconductor, Inc – provides the functional version of the on-chip modules

Internal Clock Source (S08ICSV2)
If EREFSTEN is set and the ERCLKEN bit is written to 1, the external reference clock will keep running
during stop mode in order to provide a fast recovery upon exiting stop.
8.4.7 Fixed Frequency Clock
The ICS presents the divided FLL reference clock as ICSFFCLK for use as an additional clock source for
peripheral modules. The ICS provides an output signal (ICSFFE) which indicates when the ICS is
providing ICSOUT frequencies four times or greater than the divided FLL reference clock (ICSFFCLK).
In FLL Engaged mode (FEI and FEE) this is always true and ICSFFE is always high. In ICS Bypass
modes, ICSFFE will get asserted for the following combinations of BDIV and RDIV values:
• BDIV=00 (divide by 1), RDIV ≥ 010
• BDIV=01 (divide by 2), RDIV ≥ 011
• BDIV=10 (divide by 4), RDIV ≥ 100
• BDIV=11 (divide by 8), RDIV ≥ 101
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
Freescale Semiconductor
127